高效率高稳定性LD角侧泵浦Nd∶YAG电光调Q激光器  

High-Efficiency and High-Stability LD Corner-Side-Pumped Nd∶YAG Electro-Optical Q-Switched Laser

作　　者：郭嘉祥 朱占达[1,2,3,4] 王路达 雷訇 李强[1,2,3,4] Guo Jiaxiang;Zhu Zhanda;Wang Luda;Lei Hong;Li Qiang(College of Physics and Optoelectronic Engineering,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Center of Applied Laser Technology,Beijing 100124,China;Beijing Colleges and Universities Engineering Research Center of Advanced Laser Manufacturing,Beijing 100124,China;Key Laboratory of Trans-Scale Laser Manufacturing Technology,Ministry of Education,Beijing 100124,China)

机构地区：[1]北京工业大学物理与光电工程学院,北京100124 [2]北京市激光应用技术工程研究中心,北京100124 [3]激光先进制造北京市高等学校工程研究中心,北京100124 [4]跨尺度激光成型制造技术教育部重点实验室,北京100124

出　　处：《激光与光电子学进展》2025年第1期232-236,共5页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(62075003,62275007);北京市教委科研计划(KZ202110005010)。

摘　　要：设计并通过实验验证了一种激光二极管角侧泵浦Nd∶YAG电光调Q激光器,实现了高效率、高稳定性的1.06μm脉冲激光输出。通过采用低掺杂的Nd∶YAG晶体作为增益介质及在其两侧键合Sm∶YAG晶体来抑制放大自发辐射和寄生振荡;采用角泵浦直接抽运的方式,增大泵浦吸收光程来提高增益晶体的泵浦吸收效率,采用Z字形结构改善热效应。在泵浦脉冲能量为383 mJ、重复频率为20 Hz、泵浦脉冲宽度为230μs的条件下,获得了单脉冲能量为97.5 mJ、脉冲宽度为7 ns的激光输出,输出能量的动静比为95.3%,光-光转换效率为25.43%,两个方向的光束质量因子Mx2=4.31,My2=4.67,持续工作140 s时间内调Q输出能量变化小于2%,连续3个工作循环的能量不稳定度同样小于2%,每次输出能量衰减分别为1.59%、2.11%,输出能量总衰减为3.67%。A laser diode(LD)corner-pumped Nd∶YAG electro-optical Q-switched laser with high efficiency and high stability that generates a 1.06-μm pulse laser output is designed and experimentally verified.Amplified spontaneous emission and parasitic oscillation are suppressed by using a low-doped Nd∶YAG crystal as a gain medium and a bonding Sm∶YAG crystal on both sides.The angular pump direct pumping method is used to increase the pump absorption optical path and thus increase the pump absorption efficiency of the gain crystal,and a zig-zag structure is used to improve the thermal effect.Under the conditions of a pump pulse energy of 383 mJ,repetition frequency of 20 Hz,and pump pulse width of 230μs,laser output with a single pulse energy of 97.5 mJ and pulse width of 7 ns is obtained.The dynamic-to-static ratio of the output energy is 95.3%,the optical-to-optical conversion efficiency is 25.43%,the beam quality factors in two directions are M 2 x=4.31 and M 2 y=4.67,the change in Q-switched output energy within 140 s is less than 2%,and the energy instability of three consecutive working cycles is also less than 2%.The individual output energy attenuations are 1.59%and 2.11%,and the total output energy attenuation is 3.67%.

关 键 词：激光器 电光调Q Z字形结构 高效率 高稳定性 

分 类 号：TN248.1[电子电信—物理电子学]